I certainly can't speak to the rest of Mexico, but Playa del Carman certainly has adopted the bicycle for everyday work purposes. It could be that one of the busiest streets, as well as the street to the ferry terminal, were pedestrian-only corridors.
We saw bikes that shuttled people from the ferry to taxis or to their hotels,(these ones were waiting for their riders to finish breakfast before heading off to the docks)
serving as a fresh-squeezed orange juice stands for morning commuters,
and supporting floats in parades.